Perpetual calendar.



H. LANGMAN.

PERPETUAL CALENDAR. APPLICATION FILED JULYZ. 1915.

1 1 87,344. Patented June 13, 1916.

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7292776227 ,26. olw zfi 7 By A WORN/5V8 THE COLUMBIA PLANOGRAPH c0., WASHINGTON, D. c.

H. LANGMAN.

PERPETUAL CALENDAR} APPLICATION FILED 1uLY2.. .i91s,

Patented June13, 1916.

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PERPETUAL CALENDAR.

Specification of Letters Patent.

Patented Jam. 13, 1916.

Application filed July 2, 1915. Serial No. 37,676.

To all whom it may concern:

Be it known that I, HARRY LANGMAN, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Perpetual following is a full, clear, scription.

My invention has for its object to provide a perpetual calendar having two cards movably mounted on a base card on which thecenturies are indicated, one of the cards having marked thereon the months and the days of the months, and the other card having marked thereon the different years'in a century so that when the card with the years marked thereon is moved into position where the year in question will be disposed relatively' to the other card at the month and the day of the month in ques tion and the two cards are positioned rela tively to the base card, the day of aweek which is marked on the base card will be exhibited through openings in the two cards mounted thereon.

vAdditional objects of the invention will appear in the following specification in which the preferred form of my invention is disclosed.

In the drawings similar reference characters refer to similar parts in all the views in which Figure 1 is a plan view showing my calendar; Fig. 2 is a transverse sectional'view; and Fig. 3 is an enlarged fragmentary view showing the lettering on the base card, the said lettering being disposed beneath the other cards mounted on the base card.

By referring to the drawings it will be seen that a base card 5 is provided, and that rotatably mounted on this base card 5 there is a card 6 and a card 7 ,the said cards 6 and 7 rotating on the pivot 8.

There areindicated on the base card 5 the and exact dedays of the week, these days of the week,

being indicated in 4:2 radial columns, 9, the days of the week in each column being repeated so that in each column a day will be indicated seven times. The columns are.

shown at 9. As'will be seen by referring to Fig. 3 of the drawings in which this lettering is indicated, the columns with the days of the week are arranged in the following order; Sunday, Friday, Wednesday, Mon= Calendar, of which the day, Saturday, Thursday and Tuesday and again Sunday. This order of lettering is followed completely around the cycle. The card 6 is disposed on this basecard 5 as indicated in Fig. 2 of the drawings, this-card 6 having indicated thereon the months of the year and the days of the months. It willbe seen that the card 6 is divided into six sectors 10 and that two months and the days of said month are indicated in each of the said sectors 10, the first month in the'calendar of the two months being indicated at the outer side of the second month, the days of the month being indicated in seven columns in each sector. The days of the months are indicated from left to right, the first day of each month being indicated in one column in advance of the last day indicated in the preceding month, this order being also followed when the days/of the next month are indicated at the outer side of the next sector. As there are seven radial columns 6*" in each sector 10 and as there are six sectors 10 it will be seen that on the card 6 there are 42 radial columns in which the days of the-months are indicated. As will be seen by referring to Fig. 1 the calendar for 1915 is shown on the card 6 with the exception that in February twentynine days are indicated, The card 7 is mounted on the card 6, this card 7 being of less diameter than the card 6 so that all of the days of the months in the sectors 10 on the card 6 will be exhibited at all times. The card 7 has 42 radialcolumns 11, the years of a century being indicated in these radial columns 11 and '12, the said years being arranged from left to right in these columns, there being a space in every fourth column left blank so that in using the calendar the leap years will be accounted for. On the base card 5 beyond the card 6 thereare indicated in radial colunms 13, centuries 1 1.

In the card 6 there are six sets of orifices 15 there being seven orifices in each of these sets and the orificesin each setbeing curved as indicated by the dotted lines shown in Fig. 1 of'the drawings. These orifices 15 are spaced apart so that they will be disposed one in each of the radial columns 9 when the card 6 is adusted relatively to the base card 5; the orifices 15 in the different sets being also disposed in circles corresponding with the y o hew'eek i th e eral 001- umns 9. In the card 7 there is a set of orifices 16, this set of orifices 16 being also curved as shown by the full lines in Fig. 1 of the drawings. These orifices 16 are arranged so that they will also be disposed in radial columns, and in circles corresponding with the days of the week in the several columns 9; but this set of orifices 16 is curved in a direction opposite to the direction of the curves of the sets of orifices 15.

When the cards 6 and 7 are in proper rela-' tive position, one and only one orifice 16 will register with one orifice 15 to expose a day of the week in a column 9.

When using the calendar and some day of the week in 1900 is to be ascertained, the card 6 is rotated until the column having the day of the month is disposed radially with the column 13 having the century 14 The card 7 is then rotated until the column of the year in the century indicated is disposed radially with the columns in which the day of the month and the century are indicated and when this has been done it will be found that the day of the week on the card 5 will be exhibited by the registration of one of the orifices 16 with one of the orifices 15.

As will be seen by referring to Fig. 1 of the drawings, the day of the week of May 6, 1914:, is indicated by the registration of the orifices 15and 16, this day being Wednesday. l/V hen the day of the week in an even century is to be ascertained, the card 7 is rotated until the column 12 is disposed radially'with reference to the radial column 13 in which the century is indicated, the card 6 being rotated in the manner which has already been described. However, should the century in the column 13 be underlined as at 13 the user should follow the arrow 13 and make use of the century column 13 when ascertaining a day in the first two months of the year.

When a day of January or February of a leap year is to be found the radial column 11 to the left of the year indicated on card 7 is used.

When a day is to be found in a century not shown it is merely necessary to go back or forward in four year periods until one of the centuries in the columns 13 is reached when the procedure indicated above may be followed.

Leap years on the card 7 may be designated in colors, and the arrows 11 may be 7 used to indicate the columns 11 which are to be employed in place of the columns 11in which the leap years appear when the day is in January or February.

Having thus described my invention 1 claim as new and desire to secure by Letters Patent:

1. In a perpetual calendar, three cards movably disposed over each other, there being indicated on the bottom card the centuries and the days of the week, there being indicated on the intermediate card the months, and the days of the months, and

there being indicated on the upper card the and days of the months, there being indicated on theupper card in radial columns the years in a century, there being openings in the intermediate and the upper card to expose a day of the week on the bottom card when the year on the upper card and the day of the month on the intermediate card are brought into position relatively to the base card.

3. In a perpetual calendar, three cards movably disposed relatively to and over each other, there being on the base card a century mark, and a plurality of columns in which 9 the days of the week are indicated, there being a plurality of columns on the intermediate card in which the months and days of the months areindicated, there being a plurality of columns on the upper card in which the years are indicated, there being openings in the intermediate and upper cards for ex posing the days of the week indicated on the bottom card.

4. In a perpetual calendar, three cards movably disposed relatively to and over each other, there being a century mark and days of the week indicated on the base card, there being months and the days of the months indicated on one of the other cards, there being years indicated on the remaining card, there being openings in the intermediate and upper cards for the purpose specified.

5. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the base card a century mark and the days of the week in 42 columns, there being indicated on the intermediate card the months, and the days of the months in 4:2 columns, there being openings in the intermediate and upper cards for the purpose specified.

6. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the bottom card a century mark and the days of the week in columns, the days in the columns being repeated and the columns being arranged so that the columns of days will be arranged in the following order ;Sunday,

Friday, Wednesday, Monday, Saturday, Thursday and Tuesday, there being indicated on one of the other cards the'months, and the days of the months, and there being indicated on the remaining card the years, there being openings in the last two mentioned cards for the purpose specified.

7. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the base card, the days of the week, there being indicated on one of the remaining cards, the months, and the days of the months in columns, the columns being separated in divisions of seven with the first day of each month in one division, one column in advance of the last day of the preceding month in the preceding division, there belng indicated on the remaining card the years, there being openings in the last two mentioned cards for exposing one at a time the days of the week on the base card.

8. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the base card the days of the week, there being indicated on one of the other cards the months and the days of the months, there being indicated in columns on the remaining card the years which read from one side to the other with each fourth year advanced a column, there being openings in the last two mentioned cards for exhibiting the days of the week on the first mentioned card.

9. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the bottom card the days of the week in columns, the days in the columns being repeated, and the columns being arranged so that the columns of days will be arranged in the following order '.Sunday, Friday, \Vednesday, Monday, Saturday, Thursday and Tuesday, there being indicated on one of the other cards the months, and the days of the months in columns, the columns being separated in divisions of seven with the first day of each month in one division, one column in advance of the corresponding column in which the last day and the month in the preceding division is indicated,,there being indicated in the columns on the remaining card the years which read from left to right with each fourth year advanced a column, there being openings in the last two mentioned cards for the purpose specified.

10. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the bottom card, the days of the week in columns, the days in the columns being repeated so that in each column a day will appear seven times and the columns being arranged so that the columns having the days will follow each other in the following order appear seven Sunday, Friday, Wednesday, Monday, Saturday, Thursday and Tuesday, there being indicated on one of the other cards the months, and the days of the months in columns, the columns being separated in divisions of seven with the first day of each month in one division, one column in advance of the corresponding column in which the last month of the month in the preceding division is indicated, there being indicated in the columns on the remaining card, the years which read from left to right with each fourth year advanced a column, there being six sets of openings in one of the last two mentioned cards with seven openings in each set, and there being seven openings in the other of the last two mentioned cards.

11. In a perpetual calendar, three cards disposed over and movable relatively to each other, there being indicated on the base card the days of the week in 42 columns, the days in the columns being repeated so that in each column the day will be indicated seven times, the'columns being arranged so that the columns ofdays will follow each other in the following order Sunday, Friday, Wednesday, Monday, Saturday, Thursday and Tuesday, there being indicated. on one of the other cards the months and the days of the months in 42 columns, the columns being separated in di: visions of seven with the first day of each month in one division, one column in advance of the column of the corresponding column in the preceding month in which the last day of the month is indicated, there being indicated in 42 columns on the remaining card, the years with each year advanced one column and with the fourth year advanced an additional column, there being a plurality of sets of openings in one of the last two mentioned cards with seven openings in each set, and there being a plurality of openings in the other of the last two mentioned cards.

12. In a perpetual calendar, three cards rotatable coaxially relatively to each other, there being indicated on the bottom cards, the days of the week in radial columns the days in the radial columns being repeated so that in each radial column the day will times and the radial columns being arranged so that the radial columns having the days will follow each other in the following order: Sunday, Friday,Wednesday, Monday, Saturday, Thursday and Tuesday, there being indicated on one of the other cards the months, and thedays of the months, in columns, the radial columns being separated in divisions of seven with the first day of each month in one division, one day in advance of the corresponding radial column in which the last day' of the month in the radial columns on the remaining card, the years which read from left to right with each fourth year advanced a radial column, there being a curved series of openings in the last two mentioned cards.

13. In a perpetual calendar, three cards rotatable coaXially relatively to each other there being indicated on the base card the days ofthe week in 42 radial columns, the days in the radial columns being repeated so that in each column the day will be indicated seven times, the columns being arranged so that the columns of days will follow each other in the following order Sunday, Friday, lVednesday, Monday, Saturday, Thursday, and Tuesday, there being indicated on one of the other cards the months and the days of the months in 42 radial columns, the columns being separated in divisions of seven with the first day of each month in one division, one column in advance of the column of the corresponding column in the preceding month in Which the last day of the month is indicated, there being indicated in 42 radial columns on the remaining card, the years with each year advanced one column and with the fourth year advanced an additional column, there Games of. this patent may be obtained for being a plurality of sets of openings in one of the last tWo mentioned cards With seven openings in each set, and there being a plurality of openings in the other of the last two mentioned cards.

14. In a perpetual calendar, three cards movably disposed over each other there being indicated on one of the cards the cen turies, there being indicated on another card the months and the days of the months, and there being indicated on the remaining card the years in a century, there being indicated on the bottom card the days of the week,

there being orifices in the intermediate and in the upper card which registers with each other to expose a day of the week on the bottom card When the three cards are disposed in proper relationship.

In testimony whereof I have signed my name to this specification in the presence of the two subscribing Witnesses.

EvnRAnD B. MAnsHALL, GEORGE E. EMSLIE.

five cents each, by addressing the "Commissioner of Patents, Washington, D. 63. 

